نتایج جستجو برای: ophiolitic
تعداد نتایج: 353 فیلتر نتایج به سال:
A 10 μm particle of cuprous gold was found in the phosphate-argillaceous matrix a three-layer Fe-Mn crust dredged from Guyot Alba Magellan Seamount (Pacific Ocean). The studied with scanning electron microscope at Institute Volcanology and Seismology, Far East Branch Russian Academy Sciences. is represented by an admixture platinum (up to 3.1 wt % Cu up 1.7 Pt). composition impurities suggests ...
ASTER (Advanced Spaceborne Thermal Emission and Reflection) satellite imagery is useful in assisting lithologic mapping and, however, its effectiveness is yet to be evaluated for lithologic complex such as tectonic mélange. The Mugagangri Group (MG), the signature unit of the Bangong-Nujiang suture zone (BNSZ), Tibet and consisting of ophiolitic mélanges, was previously mapped as a single unit ...
Earth is the only known planet with subduction zones and plate tectonics, and this fact demonstrates that special conditions are required for this mode of planetary heat loss. Sinking of cold, dense lithosphere in subduction zones is the principal plate-driving force, so plate tectonics could not have begun until Earth cooled sufficiently to allow lithosphere to collapse into the underlying ast...
Metamorphic rocks that mostly consist of amphibolite, amphibole schist, garnet hornblendite and rarely metamorphosed chemical and terrigenous sediments are found in the ophiolitic complex of north Torbat-E- Heidarieh. Thermobarometry calculations of amphibolite samples indicate temperature higher than 800 °C and pressure less than 5 Kb. Metamorphic conditions of amphibole schist and garnet hor...
Major rock units of Robat Sefid ophiolitic complex are Late Cretaceous in age. The abundance of rock units in this area in ascending order are: dunit, harzburgite and pyroxenite), gabbro and diabasic dikes (mostly rudenginized). Chromite lenses are generally covered by a few centimeters to several meters of ultramafic rocks mainly of dunite. Primary disseminated and massive textures are abundan...
منطقه دره پهن بخشی ازکمربند افیولیتی نائین- بافت می باشد که در استان کرمان و در بخش جنوب شرقی شهرستان بافت قرار دارد. این مجموعه شامل سنگ های فوق بازی عمدتاً هارزبورژیت و پیروکسنیت، سنگ های بازی شامل گابروها، بازالت و دلریت می باشد. از سایر سنگ های آذرین می توان دیوریت، کراتوفیر و پلاژیوگرانیت را نام برد. سنگ های دگرگونی شامل شیست سبز و آمفیبولیت می باشند. سنگ های رسوبی منطقه را آهک ها تشکیل می ...
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